The Fallout 4 special edition includes a replica Pip-Boy that can hold your phone, allowing you to run the Fallout 4 companion app as you play. But if you’re going to spend $120 on the special edition, you better make sure you have a phone that can fit inside the Pip-Boy first.

A post to the Bethesda Blog confirmed that the replica Pip-Boy will have foam inserts that fit iPhone 6, iPhone 5/5s, iPhone 4/4S, Samsung Galaxy 5, Samsung Galaxy 4, and most smartphones of a similar size. Larger smartphones like the iPhone 6+ will still let you run the companion app, but won’t fit inside the Pip-Boy.

“As we wanted to stay faithful to the dimensions of the in-game model, any smartphones larger than the models listed will not fit inside the wearable device,” Bethesda said. “For these larger devices, our Pip-Boy companion app will still be available.”

Fallout 4 launches November 10 for the Xbox One, PlayStation 4, and PC. It’ll be 1080p and 30 frames per second on consoles, but unrestricted on PC. While you wait for its release, check out our interview with game director Todd Howard.